Stihl FS 450 Instruction Manual - Page 35
Electric Handle, Heating, Checking the Spark Plug
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English / USA Electric Handle Heating At the end of the cold season: : Remove the special air filter (2) for winter operation and install the standard filter (1) in its place. : Push the cover (3) into the summer position (lower illustration). Checking the Spark Plug 256BA076 KN 000BA002 KN Switching on handle heating (special option) : Move the switch in the left handle to Z - move the switch back to O to turn off the heating. If the handle temperature feels too high - move switch to O. There is no risk of overheating during long periods of operation. The heating system is maintenance-free. Contact your servicing dealer if you have any problems. Wrong fuel mix (too much engine oil in the gasoline), a dirty air filter and unfavorable running conditions (mostly at part throttle etc.) affect the condition of the spark plug. These factors cause deposits to form on the insulator nose which may result in trouble in operation. 34 FS 300, FS 350, FS 400, FS 450, FS 480